[PyQt] 回复： 回复： how to cast the returned pointer of QImage::scanLine(int i) toQRgb ? format is Format_RGB32

[iMath]

but you mentioned here 
http://pyqt.sourceforge.net/Docs/PyQt4/gotchas.html#support-for-void


 A sip.voidptr may also be given a size (ie. the size of the block of memory that is pointed to) by calling its setsize() method. If it has a size then it is also able to support Python’s buffer protocol and behaves like a Python memoryview object 




Is this mean A sip.voidptr doesn't have a size by default ? if it is ,then sip.voidptr couldn't support  Python’s buffer protocol,right ?




------------------ 原始邮件 ------------------
发件人: "phil";<phil at riverbankcomputing.com>;
发送时间: 2014年1月10日(星期五) 晚上8:16
收件人: "iMath"<2281570025 at qq.com>; 

主题: Re: 回复： how to cast the returned pointer of QImage::scanLine(int i) toQRgb ? format is Format_RGB32



On 10-01-2014 12:04 pm, iMath wrote:
> ok.BTW, if it is possible ,I think functions returning pointer in Qt
> should return Python memoryview object in PyQt .

That would be an incompatible change. In any event the sip.voidptr 
should be able to be used in place of a memoryview object as it supports 
the buffer interface.

Phil
.
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